<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" >
      </div>
      <!-- 表单区域 -->
      <el-form label-width="0px" class="login_form" :model="loginFrom" :rules="loginFromRules" ref="loginFormRef">
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input prefix-icon="iconfont icon-user" v-model="loginFrom.username"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input prefix-icon="iconfont icon-3702mima" v-model="loginFrom.password" type="password"></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
  export default {
    data(){
      return{
        //登录表单的数据绑定对象
        loginFrom:{
          username:'admin',
          password:'123456'
        },
        //表单验证规则对象
        loginFromRules:{
          //用户名是否合法
          username: [
            {required:true,message:'请输入正确的用户名',trigger:'blur'},
            { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur'},
          ],
          //用户名是否合法
          password:[
            {required:true,message:'请输入正确的密码',trigger:'blur'},
            {min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur'}
          ]
        }
      }
    },
    methods:{
      //重置登录表单
      resetLoginForm(){
        this.$refs.loginFormRef.resetFields()
      },
      login(){
        //预验证
        this.$refs.loginFormRef.validate( async valid => {
          // console.log(valid)  //验证的结果 是布尔值
          if(!valid) return;    //如果valid为false 我们就不发起请求

          //data单独结构
          const {data : res} = await this.$http.post('login',this.loginFrom);
          // console.log(res)

          //弹框信息
          if(res.meta.status !== 200) return this.$message.error('登录失败')
          this.$message.success('登录成功')

          //把token保存在sessionStorage中
          window.sessionStorage.setItem('token',res.data.token)

          //通过编程式导航跳转到页面的后台，地址为/home
          this.$router.push('/home')
        })
      }
    }
  };
</script>

<style lang="less" scoped>

.login_container{
  background-color: #2b4b6b;
  height: 100%;
}

.login_box{
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%,-50%);
  width: 450px;
  height: 300px;
  background-color: #eee;
  border-radius: 3px;
  .avatar_box{
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #ddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%,-50%);
    bbackground-color: #fff;
    height: 130px;
    width: 130px;
    img{
      width: 100%;
      height: 100%;
      border-radius: 50%;
      bbackground-color: #eee;
    }
  }
}

.btns{
  display: flex;
  justify-content: flex-end;
}

.login_form{
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0px 20px;
  box-sizing: border-box;
}

</style>
